In this experiment with the Jasuto Modular synth (http://www.jasuto.com/main/) , Mark has got Noise node modulating FM of a Triangle wave and a sample. The noise node is moving slowly via motion modulation. He added an Accelerometer device which is modulating LFO FM of Square node and delay time. His iPad is held to a mic stand with The Gig Easy Mount (https://thegigeasy.com/) which allows him to move the iPad around pretty aggressively without worrying about a drop. The video also illustrates that motion is relative and even though he manually move the Noise node, it keeps moving with the recorded motion relative to where he drags it.

Here is a Single patch on the Accelerator that attempted to replicate the sound of a Roland Jupiter-8. Chords were played over a sequenced portion of the same patch.
With clever programing a digital synth can sound really analog.